<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- 1. 表格行要求 编号、科目、成绩、和 删除链接
        2. 最后计算出总分 和 平均分 -->
    <script>
        let data = [
            { subject: '语文', score: 46 },
            { subject: '数学', score: 80 },
            { subject: '英语', score: 100 },
        ]
        let sum = 0;// 计算总分
        let item = ''
        for (let i = 0; i < data.length; i++) {
            item += `        
            <tr>
                <td>${i + 1}</td>
                <td>${data[i].subject}</td>
                <td>${data[i].score}</td>
                <td><a href="#">删除</a></td>
            </tr>`
            sum += data[i].score
        }
        document.write(`
        <div id="app" class="score-case">
          <div class="table">
            <table>
              <thead>
                <tr>
                  <th>编号</th>
                  <th>科目</th>
                  <th>成绩</th>
                  <th>操作</th>
                </tr>
              </thead>
              <tbody>
                ${item}
              </tbody>
              <tbody>
                <tr>
                  <td colspan="5">
                    <span class="none">暂无数据</span>
                  </td>
                </tr>
              </tbody>
    
              <tfoot>
                <tr>
                  <td colspan="5">
                    <span>总分：${sum}</span>
                    <span style="margin-left: 50px">平均分：${sum / data.length}</span>
                  </td>
                </tr>
              </tfoot>
            </table>
          </div>
    
        </div>
        `)
    </script>
</body>

</html>